Crealloc() question.

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include <time.h>

int main()
{
    unsigned char *test;
    int i;
    test = (unsigned char*)malloc(5);

    for(i = 0; i < 5; i++)
    {
        test[i] = 0x11;
    }
     for(i = 0; i < 5; i++)
    {
        printf("%d. 0x%x\n ", i, test[i]);
    }

    printf("\n");


    test = (unsigned char*)realloc(test,3);

     for(i = 3; i < 5; i++)
    {
        test[i] =0xff;

    }

    for(i = 0; i < 5; i++)
    {
        printf("%d. 0x%x \n", i, test[i]);
    }

    free(test);

    return 0;
}